Question about sabbats

[Thunder]

Shortly, I was on a trip when I started seeing more and more jews all dressed-up elegant and with the kippa. I then realised they were coming from a sinagogue nearby, from the sabbat.
I then checked the astrological hour on their site. They always begin on the middle of the hour of Venus and end on the middle of the hour of Mercury.
HPs, why do they use such hours to hold their ritual?
Is this related to the star of David, the materialisation of their goal? These hours make me think about that.